tpm2_ptool init needs help output updates

[williamcroberts]

Some of the help text is wrong, outdated or unclear, update it like so:

--- old.txt	2023-03-17 12:43:25.724826589 -0500
+++ new.txt	2023-03-17 12:45:22.650756900 -0500
@@ -9,7 +9,7 @@
                         commands
     init                Initializes a tpm2-pkcs11 store
     destroy             Destroys a tpm2-pkcs11 store
-    dbup                Initializes a tpm2-pkcs11 store
+    dbup                Checks the db version and performs a db update if needed.
     rmtoken             Removes a token from a tpm2-pkcs11 store
     verify              Verifies the userpin and/or sopin for a given profile.
     addtoken            Adds an initialized token to a tpm2-pkcs11 store
@@ -21,14 +21,12 @@
     listtokens          Lists tokens in a specified store.
     listobjects         Lists Objects (keys, certificates, etc.) associated
                         with a token.
-    import              Imports a rsa key to a token within a tpm2-pkcs11
-                        store.
+    import              Imports a raw key (eg openssl genrsa) into a token.
     addkey              Adds a key to a token within a tpm2-pkcs11 store.
     addcert             Adds a certificate object
     objmod              Dumps and modifies objects.
     objdel              Deletes an object from a token.
-    link                Imports an existing TPM key to a token within a
-                        tpm2-pkcs11 store.
+    link                Imports an existing TPM key to a token.
     export              Exports an object from a token to a specified format.
 
 optional arguments: